All 390 companies in Y Combinator's Summer 2021 batch, with team size, growth, open roles and funding.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
| Company | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|
The everything app for LATAM | 1,132 | +10% | +27% | 1 | $71M | Series A$47M, Jun 2022 |
A modern-day mental healthcare company for global workforces. | 693 | −2% | +1% | 0 | $32.8M | Corporate round$19.8M, Mar 2023 |
Learning platform for job seekers with job applications automation | 533 | −5% | −5% | 0 | $9.5M | Series A$8M, Mar 2023 |
Fair, simple and accessible financial services | 480 | +4% | +15% | 2 | $86.8M | Corporate round$53M, May 2026 |
Online Training for Healthcare Jobs | 449 | +12% | +33% | 36 | $111M | Series C$55M, Jun 2026 |
Onebrief makes military headquarters run seamlessly | 391 | +9% | +55% | 7 | $311M | Grant$114K, Jul 2026 |
Account Receivables Platform for Latin American Enterprises | 367 | +10% | +27% | 14 | $66.5M | Series A$48M, Apr 2025 |
IP operating software for brands and content companies | 289 | +6% | +19% | 0 | $89M | Series B$48M, Sep 2025 |
The global financial platform for affluent consumers in the Americas. | 277 | +49% | +147% | 24 | ||
Online cohort based courses for architects, engineers and designers… | 261 | −7% | −16% | 0 | $1.2M | Seed$1.2M, May 2023 |
Web search rebuilt for LLMs | 243 | +46% | +117% | 28 | $357M | Series C$250M, May 2026 |
B2B payments, transforming Africa's cash economy | 240 | +2% | +2% | YC | $18.2M | Non-equity support$15M, Nov 2024 |
We help students in Latin America graduate from College. | 226 | −5% | +1% | 0 | $460K | YC investment$125K, Aug 2021 |
Payments and scheduling for services professionals in LATAM | 186 | +13% | +28% | 0 | $1.6M | Seed$1.5M, Nov 2021 |
Transforming Mental Health for Corporate Asia | 170 | +2% | +33% | YC | $2.9M | Seed$2M, Feb 2022 |
One API to get clean data from any website for your AI agents at scale | 160 | +13% | +27% | 0 | $2M | Seed$2M, Dec 2021 |
Learning app for school students in Southeast Asia | 157 | +13% | +15% | 0 | $1.7M | Seed$1.6M, Jan 2022 |
We make instant offers to buy homes in India | 142 | +7% | +37% | 0 | $7.2M | Seed$5.8M, Jun 2022 |
Track & Boost Your Brand’s Visibility in AI Search | 141 | +3% | +22% | 1 | $2.6M | Seed$2.5M, Sep 2021 |
Offers insurance to customers in a convenient & transparent way | 136 | +5% | +15% | 0 | $6.7M | Seed$3.3M, Nov 2024 |
Get matched with top 1% of talents in 24h | 134 | −10% | −11% | 1 | $2.9M | Non-equity support$800K, Mar 2022 |
Turning space into a transportation layer for Earth | 131 | +20% | +30% | 3 | $54.3M | Series A$44M, Nov 2024 |
AppX helps social media creators launch their own mobile apps. | 129 | +2% | +30% | 2 | $1.4M | Seed$1.3M, Jan 2022 |
Corporate Card solution for Indian businesses | 127 | −8% | −9% | 0 | $38.3M | Debt$7.1M, May 2022 |
Amazon Level Logistics for eCommerce Companies in MENA. | 126 | +11% | +8% | 0 | $2.6M | Pre-seed$2.4M, Oct 2021 |
We visually monitor space objects for governments and defense | 125 | +12% | +21% | 0 | $38.4M | Series B$26.4M, Sep 2026 |
AI-enabled financial automation and intelligence for CPG Brands | 121 | +89% | +163% | 22 | $75M | Series B$55M, Sep 2026 |
One source of truth for financial data. | 107 | +18% | +45% | 1 | $46.1M | Series B$29.2M, Sep 2025 |
Lattice for Latam with personalized learning and development | 107 | +2% | +1% | 0 | $300K | Seed$300K, Oct 2024 |
Building the human layer of AI | 104 | +4% | +33% | 8 | $64.2M | Series B$40M, Nov 2025 |
Water risk mitigation for industrial sites | 102 | −1% | 0 | $18.3M | Non-equity support$150K, Sep 2026 | |
Building India's fast food empire | 101 | −2% | 0 | |||
Global online sales platform | 101 | −5% | +7% | 3 | $125K | YC investment$125K, Jan 2022 |
Easiest way for companies to process data requests from governments | 99 | +22% | +62% | 5 | $41.2M | Series A$21.2M, Sep 2025 |
Banking, corporate cards, stablecoin payments, available globally. | 98 | +31% | +63% | 3 | $160M | Series C$100M, Apr 2026 |
Simplified digital health insurance for Filipino SMBs | 98 | +4% | +11% | 12 | $6.5M | Seed$6.5M, Jul 2024 |
Building Job driven Virtual Tech University for India 🇮🇳 | 95 | −7% | +32% | YC | $125K | YC investment$125K, Jan 2022 |
AI-native on-call and incident response carefully crafted to help… | 93 | +22% | +27% | 1 | $15.2M | Series A$12M, Aug 2023 |
Making it easy for employees to donate and volunteer with good causes. | 93 | −8% | −13% | 0 | $12.8M | Series A$10M, Dec 2021 |
Organic and gourmet high-protein meals, designed for longevity. | 91 | +8% | +7% | 0 | $16.1M | Seed$14M, May 2022 |
Cohort-based online courses for professionals in Latin America | 90 | +3% | +2% | 0 | $2.4M | Seed$2.3M, Mar 2022 |
Gusto for India | 88 | −3% | −8% | 1 | $4.1M | Seed$4M, Sep 2021 |
Flexible On-Demand Storage Space for Household, SMEs & Travellers. | 85 | +12% | +20% | 0 | $630K | Seed$505K, Dec 2021 |
The AI Native Billing Platform | 84 | −7% | +6% | YC | $22.1M | Series A$15M, Mar 2024 |
A mobile app. It allows employees to get paid their salary on-demand. | 84 | +5% | −1% | 1 | $64M | Undisclosed round$21.7M, Jun 2025 |
App to help people quit or cut back on alcohol use | 83 | +1% | +2% | YC | $27.4M | Undisclosed round$10M, Apr 2022 |
We help Accountants automate work and serve their customers online | 83 | +9% | +9% | 1 | $2.7M | Seed$2.2M, Mar 2022 |
The most magical personal Voice-Led AI English Learning Buddy for Kids | 82 | +4% | +9% | 0 | $125K | YC investment$125K, Mar 2022 |
Financial data your AI can actually trust | 82 | +1% | −1% | 0 | $3M | Seed$1M, Aug 2021 |
We make software for bookkeepers. | 81 | −2% | −9% | 1 | $15.1M | Series A$6.5M, Dec 2025 |
Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.
Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.
Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.
The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.
# 1. every company with Y Combinator as an investor curl https://api.crustdata.com/company/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "field": "funding.investors", "type": "in", "value": ["Y Combinator"] }, "fields": ["basic_info.name", "headcount.total", "headcount.growth_percent", "funding.total_investment_usd"], "limit": 100 }' # 2. open listings per company, last 60 days (limit 0 = counts only) curl https://api.crustdata.com/job/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "op": "and", "conditions": [ { "field": "company.basic_info.company_id", "type": "in", "value": [...] }, { "field": "metadata.date_added", "type": "=>", "value": "2026-08-24" } ]}, "limit": 0, "aggregations": [{ "type": "group_by", "field": "company.basic_info.company_id", "agg": "count" }] }' # 3. the same company filter as a weekly watch: POST /watch/company/search
390 companies were in Y Combinator's Summer 2021 batch (S21); 284 are active.
50 companies posted roles in the last 60 days, led by Stepful (36 roles), Exa (28 roles) and ARQ (24 roles). 85 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Hirebolt (+100%), Aqua (+93%) and Confido (+89%).
Largest latest rounds in the last 12 months, after their YC batch: Exa ($250M), Slash ($100M) and Turion Space ($75M).